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Goodwill and intangible assets (Details 2) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Less: Accumulated amortization $ (719)  
Intangible assets, net $ 1,259 $ 1,608
Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Finite-Lived Intangible Assets, Gross $ 65  
Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 6 years  
Finite-Lived Intangible Assets, Gross $ 1,913